Bulb



FIG. 1 is a perspective view of a bulb showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear side being a mirror image of that shown;

FIG. 4 is a side elevational view thereof, the opposide side being a mirror image of that shown;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a perspective view of a second embodiment thereof. 

The ornamental design for bulb, as shown and described. 